Hixon, Allen L. M.D. “Preventing Street Gang Violence.” Medicine and Society. 15 April, 1999. American Family Physician. 5/5/09. <http://www.aafp.org/afp/990415ap/medicine.html>

“Reasons for Violence.” Warning Signs of Youth Violence. 2004. American Psychological Association. 5/5/09. <http://www.apahelpcenter.org/featuredtopics/feature.php?id=38&ch=2>

Satcher, David. “Youth Violence: A Report of the Surgeon General.” 1 January, 2001. US Department of Health and Human Services. 4/27/09. <http://www.surgeongeneral.gov/library/youthviolence/toc.html>
Note: This one citation encompasses several sources relating to youth violence. Although they do originate from a single portal, this information is received from various authors.

“Youth Violence: Facts at a Glance” Youth Violence Prevention. Summer 2008. Center for Disease Control. 5/11/09. <http://www.cdc.gov/ViolencePrevention/youthviolence/index.html>

“Bullying Facts and Statistics.” 27 December, 2007. National Youth Violence Prevention. 5/11/09. <http://www.safeyouth.org/scripts/faq/bullying.asp>